effectiveness of fibres in concrete due to fire
Abstract
Recent fire cases indicated again the importance of fire research. Fast development of construction technology requires new materials. Initiation and development of fire are strongly influenced by the choice of construction materials. In addition to their mechanical properties, their behaviour in elevated temperature is also of high importance. Residual compressive strength of concrete exposed to high temperatures is influenced by the following factors (Thielen, 1994): water to cement ratio, cement to aggregate ratio, type of aggregate, water content of concrete before exposing it to high temperatures and the fire process. Therefore, mix design and composition of concrete is of high importance for high temperatures. Our test results indicated that the advantageous influence of polypropylene and steel fibres in concrete subjected to high temperatures is mainly available for thin fibres and not for thick fibres. Strength reduction and
surface cracking are detailed for the tested various fibre reinforced concretes.
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